Water meter reverse flow identification method and device and water meter

The invention relates to the technical field of water meter recognition, and provides a water meter reverse flow recognition method and device and a water meter. The method comprises the steps that a flow cache table is created on a water meter storage unit; the flow cache table counts water flow data in real time; performing water meter working state classification judgment according to the water flow data in the flow cache table; and adjusting the working state of the water meter according to the classification judgment result. According to the method, the reverse flow of the water meter can be quickly and accurately recognized, whether the water meter is installed reversely or not is detected, and water use disputes caused by inaccurate reverse water use metering are avoided; surging flow can be identified, and the water meter is prevented from metering too much under the surging flow; the metering adaptability of the intelligent ultrasonic water meter is improved, and the installation and maintenance cost